Several mechanisms have been proposed in the literature defining morphological changes by the presence of nano-fillers [34]: (i) distribution of nano-fillers at the interface of polymer blends will cause interfacial tension reduction, (ii) solid barrier built by nano-fillers at the interface prevents domain coalescence, (iii) presence of solid particles increases the viscosity of the polymer domains and forms a physical network of particles immobilizing the dispersed phase, and finally (iv) coalescence inhibition by strong interaction between polymer chains and solid particles (steric hindrance).

Indeed, for a low concentration of the dispersed phase, rheological behavior of the blend can be directly correlated to the size and distribution of the inclusions in the frame of Palierne's model [37], which takes into account the effect of interfacial tension and droplet size and distribution.

As is well known, the equilibrium phase structure of a multiphase system is determined not by interfacial tension alone, but rather by the interfacial free energy which represents combination of interfacial tension and interfacial areas.

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